Add stats command, colored output, progress bar, and generation summary

- New 'archdoc stats' command showing project statistics without generating docs
  - Symbol breakdown by kind (class/function/method/async)
  - Top-10 by fan-in and fan-out
  - Detected integrations (HTTP/DB/Queue)
  - Basic cycle detection on module imports
- Colored terminal output using 'colored' crate
- Progress bar for file parsing using 'indicatif' crate
- Generation summary showing files/modules/symbols/edges/integrations

archdoc-cli/Cargo.toml

@@ -14,3 +14,5 @@ tracing = "0.1"
 tracing-subscriber = "0.3"
 anyhow = "1.0"
 thiserror = "1.0"
+colored = "2.1"
+indicatif = "0.17"